Fastening device



Nov. 16, 1943. R. c.A GAzLEY 2,334,188

' FASTENING DEVICE Filed April 21, 1942 2 Sheets-Sheet 2 A .Y l7/////////////V///// /M ig/ www R/az Zay which merges'into the base orpressure plate 3I. In this manner, the intermediate portion 31 will beinwardly offset from the inner element 23 and when the bolt I5 isrotated through 'a quarter turn, the intermediate-portion 31 of each arm29 and 30 will be drawn outwardly towards the adjacent face ofthe jointmember 23, andthe outer connecting members 3| may move outwardly inaddition to being placed under pressure by reason of the outward pullingon the intermediate portion 31. y

The opposed flat faces 25 on the reduced shank 24- are adapted to engagethe inner edges of the cutouts 33 and 34 when the bolt I5 is in lockingposition. These fiat faces I25 provide a means whereby the bolt I5 willthereby be held against accidental rotary movement towards a releasedposition without undue 'pressure being applied to the bolt I5 whichwould effect a spread of the arms 29 and 30. The shank 24 is generallyround in configuration except for the opposed flat faces g 25 and thediameter of rounded portion'v of the reduced'sh'ank 24 is V greater thanthe space between the cutouts33and v34.

` In Figures 4 to '7 inclusive, there is disclosed a slightly modifiedform of locking or clamping bolt v.wherein the bolt shank I1a is formedwith a reduced shank 24a having a clamping headl I8a outwardly extendingsubstantially straight extension 60. v The opposite end portion of thearm 53 is formed with a relatively shallow arcuate extension 6I mergingat its outer end in an oppositely curved connecting member 62. The outervend portion ofthe extension 50 also merges in at the inner end thereof.The reduced shank 24a l shown more clearly in Figure6 is provided withrounded opposite faces 39 which are struck from the same radii and asecond pair of rounded sides 40 which are struck from the same radii asthe rounded sides 29, and the junction between the rounded sides39 and40 form rounded corners 4I'. The "space` between the rounded sides 39erthew'roundedsides 4B-is equal tothe space between thecutouts 33 and 34,but by providing the roundedgsides 39 and 40, the bolt canl more readilybe rotated tojeither a locking or a released position` by application ofa .tool to the head thereof. i j

The Alongjarcvon which the rounded sides 39 and 40 are drawn providesthe rounded instead of the flat sides, which are shownat 25 in Figure l,and there is thereby provided aj substantially polygonal ,shank whichwill resist turning after it hasbeen'lapplied to the desired article.The clamping head Ia is also provided ywith arcuate opposite sides 42andg43. The radius of the arc 43 i s equal tothe'radius of the shankI1a, whereas thev radii of thetwo long arcs 42 vare of greater lengthythan the radii of the shank I1a'.

In Figure 2 the lockingy head I8 is formed with parallel or flatopposite sides 44 and rounded sides 45 disposed between the flat sides44. The radii ofA therounded sides 45 are ofthe same length estrie radiifor the shank l1.

Referring now to Figures 8 to 11 inclusive, there f is disclosed afurtherfm'odication ofthisrinvention'whichwincludes a'lockingY bolt 46provided` with'a'head`41 and a shank 48.4 The `head 4 1 in thepresentinstance is'forr'ned with a kerf 49, but itwill beun'derstoodthat, the heady 41may be of polygonalY configuration. Theshank '48 has formed integral therewith Ya reduced shank which'also hasformed, integral therewithA a camshapedclamping head 5 I Aclamping plategenerallyde'si'gnated as 52 isl adapted' to be engaged bythe'clampinghead 5I 'and comprises a pair of opposed clamping arms53`and54 which are disposed on opposite inclinations and'have'their'inneredges vspaced apart.V The arm 53 isl formed with ay cutout 55 andthe arm54 is also formed Vwith acomplementary cutout 56. The head 5I l than aquarter turn. The fastening devices here- Y an inwardly curvedconnecting member 63. The arm54 at one end thereof is formed with anarcuateV extension 64 similar to the extension 59 ofthe arm 53 and theextension 64 merges into a substantially straight `extension 65 whichvis formed integral with thefconnecting member 62. The opposite end ofthe arm `54 merges into a relatively shallow arcuate extension B6 rwhichis formed at its opposite end'integral with'the'inwardlycurvedconnecting member 63. A relatively large opening 61 is formed'at theinner edges of the arm extensions BI and 65 where these extensions mergewith the pressurefoot or connecting'member 92. vA similar large openinglis provided on'the opposite' side ofthe clamping member or nut 52, wherethe arms 60 and 66 connect with the'foot or Vconnecting member 63.

In the use of this fastening device, the articles 22 and 23 whichjare tobe fastened together are formed with the openings 29 and ZI to receivethe shank I1 of the bolt I5. The nut or pressure member formed by thearms29 and 30 is disposed opposite from the head I5 whereupon theclamping head I8 is extended, through the slot formed by the opposedcutouts 33 and 34. A tool such as v a screw driver 'or the like may thenbe applied to the head I5 and the bolt I5 rotated through a quarterturn. The rotation of thebolt I5 will be resiliently resisted 'by thearmsv 29 and 30 as inorder to rotate the bolt I5; it is necessary thatthe two' arms29 and 39 be forcibly spread apart by 'the shank 2t;Rotation o f the bolt l5 through one quarter turn'will vcause thevclamping mem-V bers'26 and21 to'press the arms 29 and 39 out- Wardlytowards` the inner joint member 23, and

where the connecting members 3| are not secured as byv other fasteningmeans or welding to the innerk joint member 23, the arms 3l willI bespread out bycompression of the outwardly divergent extensions 38 of thearms 29 and 30. The stop members 35 and 38 will limit the rotationV ofthe bolt I5 so that, in the application of the fastenmgdevice, the boltI5 will not be accidentally rotated to a degree sufficient to disposethe clamping head1 is in a position where vibration' or the ateextensions'59 and 64 of the pressure arms 53 and 54 form stop membersfor the clamping head 5I so that the bolt 46 cannot be rotated for morein disclosed' canv bemanufactured very cheaply and can be used eithervas permanent, semi-permanent or quickly removable fastening deviceswhich will not be injured by continued applicasecured in any suitablemanner to one part of the joint structure.

What I claim is:

1. A fastening device comprisingin combination a bolt member and aclamping member,'said clamping member being of resilient constructionand formed with a pair of spaced resilient arms connected together attheir outer'ends and offset from said ends, said arms having confrontingcutouts, said bolt including an outer shank, a reduced shank engageablein the opening formed by said cutouts, and laterally projectingcamshaped pressure members carried by said reduced shank freelyinsertible between said cutouts and engageable with the outer sides ofsaid arms upon partial rotation of said bolt to thereby place saidclamping member under clamping pressure, said reduced shank includingopposed pairs of arcuate sides having aradii greater in length than theradii of said outer shank forming lcarn members for holding said boltagainst rotation without application of a tool thereto partial forciblerotation of said bolt also effecting edgewise bending of said arms. i f

2. A fastening device comprisingin combination a bolt member and aclamping member, said clamping member being of resilient constructionand formed with a `pair of spaced resilient arms pressure memberscarried by said shank freely i insertible between said cutouts andengageable with the outer sides of said arms upon partial rotation ofsaid bolt to thereby place said clamping member under clamping pressurepartial forcible rotation of said bolt also effecting edgewise bendingof said arms, said arms having the opposite faces thereof at rightangles to the length of the bolt.

4. A fastening device comprising in combination a boltmember and aclamping member, said clamping member being of resilient constructionand formed with a pair of spaced resilient arms connected together attheir outer ends and offset from said ends, said arms having confrontingcutouts, said bolt including a reduced shank engageable in the openingformed by said cutouts,

said shank being formed with means engageable with opposed edges of saidcutout for normally holding saidy bolt against rotation a clampingl headintegral with said reduced shank and having flat opposite sides androunded opposite ends, partial forcible rotation of said bolt alsoeffecting edgewise bending of said arms, said arms having the oppositefaces thereof at right angles to the i length of the bolt said endsprojecting rfrom connected together at their outer ends and oiset fromsaid, ends, said arms having confronting cutouts, a rearwardly offsetstop member integral with each arm-adjacent an end of said cutout, saidbolt including a reduced shank engageable in the opening formed by saidcutouts, said shank being formed with means engageable with opposededges of said cutout for normally` holding said bolt against rotationand laterally` projecting cam-shaped pressure members carried by saidshank freely insertible between said cutouts and engageable with theouter sides of saidarms upon partial rotation of said bolt to therebyplace said clamping member, under clamping pressure partial forciblerotation of said bolt also effecting cutouts, an acutely disposedoutwardly extending extension at. one end of each arm, an obtuselydisposed outwardly extending extension at the opposite end of each arm,said bolt including a reduced shank engageable in the opening formed bysaid'cutouts, said shank being formed with means engageable with`opposededges of said cutout for normally holding said bolt againstrotation and ylaterally projecting cam-shaped edgewise bending of saidarms, 'said arms having' said reduced shank and formed with cam facesfor engagement with said arms.

5. A fastening device comprising in combination a bolt member and aclamping member, said clamping member being of resilient constructionand, formed with a pair of spaced resilient arms connected together attheir outer ends and offset from said ends, said arms having confrontingcutouts, said bolt including a. reduced shank engageable in the openingformed by said cutouts, said shank being formed with means engageablewith opposed edges of said cutout for normally holding said bolt againstrotation a clamping head integral with said reduced shank and having anelliptical configuration in transverse section, the opposite small endof said head projecting laterally of said reduced shank and formed withcam faces for engagement with said arms said head being freelyinsertible through said cutouts, said .arms having the opposite facesthereof at right angles to the length of the bolt.

6. A fastening device comprising a bolt member and a'clamping member,said clamping member being of resilient construction and formed with apair of spaced resilient arms connected together at their outer ends andoffset from-said ends, said arms having confronting cutouts, said boltincluding a reduced shank formed with at least one pair of diametricallyopposed substantially flat faces and the longest diameter of said shankbeingy greater than the distance between said cutouts, and a pressurehead integral with said shank,said head including a pair of laterallyprojecting cam-shaped pressure members engageable with the adjacent faceof said clamping member, `the transverse thickness of said headbeing'formed of at least two diameters, with one diameter being slightlyless than the combined width of said cutouts whereby said head may beinitially freely inserted through said .cutouts without distortion ofsaid arms, rotation ofsaid bolt effecting edgewise longitudinal bendingofsaid arms.

RICHARD C. GAZLEY.

